I would not suggest using GameObject.Find either, you can get gcoregui getcomponent from score script in start function, and then use it whenever you want. I'm not an JS (unityscript) guy, but I hope i understanded what you wanted.

Also, you should add a tag check before actually getting the component, because for now, it will try to get that component from everything it touches, but as those gamobject don't have that "Score" script, you will get an null reference error.